How do I optimize Mini for 8 gigs of ram?

I have a Mini (mid July 2010) that has worked flawlessly, yet I decided to install 8gigs of ram. At times I can have lots of things going on and with the original 4 gigs it seemed to bog down. Thinking more ram is the answer, of which it's apparently not, the Mini still can bog down even with the 8 gigs.
When checking Utilities and system memory it always has at least 3.5 gigs in a FREE status. No matter if I open almost everything. The system does recognize all 8 gigs it just does not use it all.
Is there some settings I need to tweak? All updates are installed. I'm not sure what to do to get the Mini to utilize all of its available ram. Or am I applying PC logic here?
Any thoughts?
Thanks,
Tom
Mac Mini mid July 2010 Intel Core 2 Duo 2.4
8 gigs of ram
Lion 10.7.4
Xfinity Extreme
DOCIS 3 modem
Airport Extreme

Hello Thomas,
Which exact RAM is this, got a link?
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
In the Memory tab, are there a lot of Pageouts?

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